Examples of access methods for class attributes and class static variables in PHP

This article mainly introduces the access methods of class attributes and class static variables in PHP, and compares and analyzes the various access techniques of class attributes, static variables and constants in PHP in the form of examples. Friends in need can refer to it

The details are as follows:

<?php
/* PHP类属性与类静态变量的访问
 * Created on 2016-7-13
 */
class test
{
 const constvar=&#39;hello world&#39;;
 static $staticvar=&#39;hello world&#39;;
 function getStaticvar(){
   return self::$staticvar;
 }
}
$obj=new test();
echo test::constvar; //输出&#39;hello world&#39;
echo @test::staticvar; //出错,staticvar 前必须加$才能访问，这是容易和类常量(per-class常量)容易混淆的地方之一
echo test::$staticvar; //输出&#39;hello world&#39;
$str=&#39;test&#39;;
//echo $str::$staticvar; //出错，类名在这不能用变量动态化
//echo $str::constvar; //出错原因同上
//在类名称存在一个变量中处于不确定（动态）状态时，只能以以下方式访问类变量
$obj2=new $str();
echo $obj2->getStaticvar();
?>

The running result is: hello world

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